Hi, Here are some interesting previous discussions on LQI:
http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2006-May/016585.html http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2008-March/031543.html http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2008-March/031548.html Hope this helps. Ittipong On 24/03/2008, antonio gonga <[EMAIL PROTECTED]> wrote: > > Hey all, > > I've a question that I'd like you to answer me. Let's start by a small > protocol/schema. > > Ar ............. SB ............. Cr ..............Base > Given the situation, imagine that sensor SB wants to relay some > information to the Base, but this info should be sent just using Ar or Cr. > I.e just those sensors Ar and Cr can relay this info to the Base. The SB > sensor uses the command CC2420Packet.getLqi(*msg) to get some Link > quality Indicator measurements of messages from Ar and Cr (let's assume, a > type of a special beacon message). My question is: Does this command > interface Gives the Link Quality Indicator in terms of SNR? or some other > parameter/measurement? > Let me assume another breaking parameter that, each control info from Cr > and Ar contains a value dtb (distance to the Base), in this case Cr is > obviously closer to the Base. The metric is that each hop it's equal to 1. > Ar(dtb) = 2; Cr(dtb) = 1; > > typedef nx_struct{ > nx_uint8_t dtb; //distance to the Base > nx_uint8_t type; //info message type > nx_uint16_t rid; //Router Id (Ar or Cr NodeID's) > }beacon_t; > > > Thanks in Advance. > -Antonio > > > > ------------------------------ > Discover the new Windows Vista Learn > more!<http://search.msn.com/results.aspx?q=windows+vista&mkt=en-US&form=QBRE> > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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